#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "wifi_manager.h"

// WiFi连接状态
static wifi_status_t wifi_status = WIFI_DISCONNECTED;
static char current_ssid[64] = {0};
static int signal_strength = 0;
static uint32_t ip_address = 0;

// HTTP请求缓冲区
static char http_request_buffer[2048];
static char http_response_buffer[4096];

// 私有函数声明
static int esp8266_send_command(const char *command, const char *expected_response, int timeout_ms);
static int esp8266_init(void);
static int esp8266_connect_ap(const char *ssid, const char *password);
static int esp8266_disconnect(void);
static int esp8266_get_ip(void);
static int esp8266_http_request(const char *method, const char *url, const char *headers, const char *body, char *response, int response_size);

/**
 * 初始化WiFi管理器
 */
int wifi_manager_init(void)
{
    DEBUG_PRINT(2, "初始化WiFi管理器...");

    // 初始化ESP8266模块
    if (esp8266_init() != 0)
    {
        DEBUG_PRINT(0, "ESP8266初始化失败");
        return -1;
    }

    wifi_status = WIFI_DISCONNECTED;
    DEBUG_PRINT(2, "WiFi管理器初始化完成");

    return 0;
}

/**
 * 连接到WiFi网络
 */
int wifi_connect(const char *ssid, const char *password)
{
    if (!ssid || !password)
    {
        DEBUG_PRINT(0, "WiFi连接参数无效");
        return -1;
    }

    if (wifi_status == WIFI_CONNECTED)
    {
        DEBUG_PRINT(1, "WiFi已连接");
        return 0;
    }

    DEBUG_PRINT(2, "连接到WiFi: %s", ssid);
    wifi_status = WIFI_CONNECTING;

    // 连接到AP
    if (esp8266_connect_ap(ssid, password) != 0)
    {
        DEBUG_PRINT(0, "WiFi连接失败");
        wifi_status = WIFI_DISCONNECTED;
        return -1;
    }

    // 获取IP地址
    if (esp8266_get_ip() != 0)
    {
        DEBUG_PRINT(0, "获取IP地址失败");
        wifi_status = WIFI_DISCONNECTED;
        return -1;
    }

    wifi_status = WIFI_CONNECTED;
    strncpy(current_ssid, ssid, sizeof(current_ssid) - 1);

    DEBUG_PRINT(2, "WiFi连接成功，IP: %d.%d.%d.%d",
                (ip_address >> 24) & 0xFF,
                (ip_address >> 16) & 0xFF,
                (ip_address >> 8) & 0xFF,
                ip_address & 0xFF);

    return 0;
}

/**
 * 断开WiFi连接
 */
int wifi_disconnect(void)
{
    if (wifi_status == WIFI_DISCONNECTED)
    {
        return 0;
    }

    DEBUG_PRINT(2, "断开WiFi连接");

    esp8266_disconnect();
    wifi_status = WIFI_DISCONNECTED;
    current_ssid[0] = '\0';
    ip_address = 0;

    return 0;
}

/**
 * 获取WiFi状态
 */
wifi_status_t wifi_get_status(void)
{
    return wifi_status;
}

/**
 * 获取当前SSID
 */
const char *wifi_get_current_ssid(void)
{
    return current_ssid;
}

/**
 * 获取信号强度
 */
int wifi_get_signal_strength(void)
{
    return signal_strength;
}

/**
 * 获取IP地址
 */
uint32_t wifi_get_ip_address(void)
{
    return ip_address;
}

/**
 * 发送HTTP GET请求
 */
int wifi_http_get(const char *url, char *response, int response_size)
{
    if (wifi_status != WIFI_CONNECTED)
    {
        DEBUG_PRINT(0, "WiFi未连接");
        return -1;
    }

    if (!url || !response || response_size <= 0)
    {
        DEBUG_PRINT(0, "HTTP GET参数无效");
        return -1;
    }

    DEBUG_PRINT(2, "HTTP GET: %s", url);

    return esp8266_http_request("GET", url, NULL, NULL, response, response_size);
}

/**
 * 发送HTTP POST请求
 */
int wifi_http_post(const char *url, const char *headers, const char *body, char *response, int response_size)
{
    if (wifi_status != WIFI_CONNECTED)
    {
        DEBUG_PRINT(0, "WiFi未连接");
        return -1;
    }

    if (!url || !response || response_size <= 0)
    {
        DEBUG_PRINT(0, "HTTP POST参数无效");
        return -1;
    }

    DEBUG_PRINT(2, "HTTP POST: %s", url);

    return esp8266_http_request("POST", url, headers, body, response, response_size);
}

/**
 * 检查网络连接
 */
bool wifi_is_connected(void)
{
    return wifi_status == WIFI_CONNECTED;
}

/**
 * 扫描WiFi网络
 */
int wifi_scan_networks(wifi_network_t *networks, int max_networks)
{
    if (!networks || max_networks <= 0)
    {
        return -1;
    }

    DEBUG_PRINT(2, "扫描WiFi网络...");

    // 发送扫描命令
    if (esp8266_send_command("AT+CWLAP", "OK", 10000) != 0)
    {
        DEBUG_PRINT(0, "WiFi扫描失败");
        return -1;
    }

    // 解析扫描结果（简化实现）
    // 实际应该解析ESP8266返回的网络列表
    int found_networks = 0;

    // 模拟扫描结果
    if (found_networks < max_networks)
    {
        strcpy(networks[found_networks].ssid, "TestNetwork");
        networks[found_networks].signal_strength = -45;
        networks[found_networks].security = WIFI_SECURITY_WPA2;
        found_networks++;
    }

    DEBUG_PRINT(2, "扫描到 %d 个网络", found_networks);

    return found_networks;
}

// 私有函数实现

/**
 * 发送AT命令到ESP8266
 */
static int esp8266_send_command(const char *command, const char *expected_response, int timeout_ms)
{
    if (!command)
        return -1;

    DEBUG_PRINT(3, "发送AT命令: %s", command);

    // TODO: 实际的串口通信
    // 1. 发送命令到ESP8266
    // 2. 等待响应
    // 3. 检查响应是否包含expected_response

    // 模拟成功响应
    DEBUG_PRINT(3, "AT命令响应: OK");

    return 0;
}

/**
 * 初始化ESP8266模块
 */
static int esp8266_init(void)
{
    DEBUG_PRINT(2, "初始化ESP8266...");

    // 测试AT命令
    if (esp8266_send_command("AT", "OK", 1000) != 0)
    {
        DEBUG_PRINT(0, "ESP8266不响应");
        return -1;
    }

    // 设置WiFi模式为Station模式
    if (esp8266_send_command("AT+CWMODE=1", "OK", 1000) != 0)
    {
        DEBUG_PRINT(0, "设置WiFi模式失败");
        return -1;
    }

    // 启用多连接
    if (esp8266_send_command("AT+CIPMUX=1", "OK", 1000) != 0)
    {
        DEBUG_PRINT(0, "启用多连接失败");
        return -1;
    }

    DEBUG_PRINT(2, "ESP8266初始化完成");

    return 0;
}

/**
 * 连接到WiFi AP
 */
static int esp8266_connect_ap(const char *ssid, const char *password)
{
    char command[256];

    // 构造连接命令
    snprintf(command, sizeof(command), "AT+CWJAP=\"%s\",\"%s\"", ssid, password);

    // 发送连接命令
    if (esp8266_send_command(command, "WIFI CONNECTED", 10000) != 0)
    {
        DEBUG_PRINT(0, "连接WiFi失败");
        return -1;
    }

    // 等待获取IP
    if (esp8266_send_command("", "WIFI GOT IP", 10000) != 0)
    {
        DEBUG_PRINT(0, "获取IP失败");
        return -1;
    }

    return 0;
}

/**
 * 断开WiFi连接
 */
static int esp8266_disconnect(void)
{
    return esp8266_send_command("AT+CWQAP", "OK", 5000);
}

/**
 * 获取IP地址
 */
static int esp8266_get_ip(void)
{
    // 查询IP地址
    if (esp8266_send_command("AT+CIFSR", "OK", 5000) != 0)
    {
        return -1;
    }

    // TODO: 解析IP地址响应
    // 模拟IP地址
    ip_address = (192 << 24) | (168 << 16) | (1 << 8) | 100; // 192.168.1.100

    return 0;
}

/**
 * 发送HTTP请求
 */
static int esp8266_http_request(const char *method, const char *url, const char *headers, const char *body, char *response, int response_size)
{
    char command[512];
    int content_length = body ? strlen(body) : 0;

    // 解析URL获取主机和路径
    // 简化实现，假设URL格式为 http://host/path
    char host[256] = "api.openai.com";
    char path[256] = "/v1/chat/completions";
    int port = 80;

    // 建立TCP连接
    snprintf(command, sizeof(command), "AT+CIPSTART=0,\"TCP\",\"%s\",%d", host, port);
    if (esp8266_send_command(command, "CONNECT", 10000) != 0)
    {
        DEBUG_PRINT(0, "TCP连接失败");
        return -1;
    }

    // 构造HTTP请求
    int request_len = snprintf(http_request_buffer, sizeof(http_request_buffer),
                               "%s %s HTTP/1.1\r\n"
                               "Host: %s\r\n"
                               "Connection: close\r\n"
                               "%s"
                               "%s"
                               "\r\n"
                               "%s",
                               method, path, host,
                               headers ? headers : "",
                               content_length > 0 ? "Content-Length: " : "",
                               body ? body : "");

    // 发送数据长度
    snprintf(command, sizeof(command), "AT+CIPSEND=0,%d", request_len);
    if (esp8266_send_command(command, ">", 5000) != 0)
    {
        DEBUG_PRINT(0, "发送数据长度失败");
        return -1;
    }

    // 发送HTTP请求数据
    if (esp8266_send_command(http_request_buffer, "SEND OK", 10000) != 0)
    {
        DEBUG_PRINT(0, "发送HTTP请求失败");
        return -1;
    }

    // 接收响应
    // TODO: 实际接收并解析HTTP响应
    // 模拟响应
    if (response && response_size > 0)
    {
        strncpy(response, "{\"response\": \"success\"}", response_size - 1);
        response[response_size - 1] = '\0';
    }

    // 关闭连接
    esp8266_send_command("AT+CIPCLOSE=0", "OK", 5000);

    return 0;
}